[Zope] how to create a module global variable ?

[Andreas Jung]

Check out the "global" statement of Python -> www.python.org -> 
Documentation

-aj

--On Donnerstag, 3. April 2003 10:45 Uhr +0200 Jerome Alet 
<alet@librelogiciel.com> wrote:

> Hi,
>
> I'd want to create a variable which is shared by all instances of a
> Python class of my own.
>
> What I've done is that I've put the following line :
>
>         _MySharedVar = None
>
> outside of any method or class definition, at the top of
> the python file which defines my class.
>
> I've done this because after having looked at Zope's sources, there
> are lots of _marker=[] there, and I guessed that's what I wanted to do.
>
> but then one method of my class has to initialize this variable if
> it is equal to None (meaning not yet initialized), but in the
> following code :
>
>     def myMethod(self) :
>         """My method."""
>         if _MySharedVar is None :
>             _MySharedVar = "yes"
>
> the "if" raises and UnboundLocalError, saying that I use
> _MySharedVar before assignment.
>
> I've tried to delete my product from the ZODB and restart Zope,
> delete and recreate my class instances, but the problem persists.
>
> What is the problem ?
>
> In Zope's sources, _marker is used directly without any "global" keyword
> use.
>
> Do I need to use the global keyword ? If yes then why ?
> If not then what did I do wrong ?
>
> thanks in advance
>
> Jerome Alet
>
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